<template>
    <el-container>
        <!-- 头部 -->
        <el-header>
            <div>
                <img src="../assets/logo.png" alt/>
                <span>后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!-- 主体 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ? '64px' : '200px'">
                <div class="toggle-button" @click="togleCollapse">|||</div>
                <el-menu
                        unique-opened
                        :collapse="isCollapse"
                        :collapse-transition="false"
                        router
                        :default-active="activePath"
                        background-color="#333744" text-color="#fff" active-text-color="#409FFF">
                    <!-- :unique-opened="true"->只允许展开一个菜单 -->
                    <!-- :collapse-transition="false" -> 关闭动画 -->
                    <!-- router -> 导航开启路由模式 -->
                    <!-- 一级菜单  -->
                    <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
                        <!-- 一级菜单的模板区域 -->
                        <template slot="title">
                            <i :class="iconObj[item.id]"></i>
                            <span>{{ item.authName}}</span>
                        </template>
                        <!-- 二级菜单 -->
                        <el-menu-item
                                :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id"
                                @click="saveNavState('/' + subItem.path)">
                            <!-- 导航开启路由模式：
                              将index值作为导航路由 -->
                            <!-- 二级菜单的模板区域 -->
                            <template slot="title">
                                <i class="el-icon-menu"></i>
                                <span>{{ subItem.authName}}</span>
                            </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!-- 内容主体 -->
            <el-main>
                <!--路由占位符-->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
    export default {
        data() {
            return {
                // 左侧菜单数据
                menuList: [],
                iconObj: {
                    '125': 'iconfont icon-user',
                    '103': 'iconfont icon-tijikongjian',
                    '101': 'iconfont icon-shangpin',
                    '102': 'iconfont icon-danju',
                    '145': 'iconfont icon-baobiao'
                },
                // 默认不折叠
                isCollapse: false,
                // 被激活导航地址
                activePath: ''
            }
        },
        created(){
            this.getMemuList()
            this.activePath = window.sessionStorage.getItem('activePath')
        },
        methods: {
            logout() {
                // 清空token
                window.sessionStorage.clear()
                this.$router.push('/login')
            },
            //获取请求菜单
            async getMemuList() {
                const {data: res} = await this.$http.get('menus')
                if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
                this.menuList = res.data
                // console.log(res)
            },
            // 菜单的折叠与展开
            togleCollapse () {
                this.isCollapse = !this.isCollapse
            },
            // 保存链接的激活地址
            saveNavState (activePath) {
                window.sessionStorage.setItem('activePath', activePath)
            }
        }
    }
</script>

<style lang="less" scoped>
    .el-container {
        height: 100%;
    }

    .el-header {
        background-color: #373f41;
        display: flex;
        justify-content: space-between;
        padding-left: 0;
        align-items: center;
        color: #fff;
        font-size: 20px;

        > div {
            display: flex;
            align-items: center;

            img {
                height: 40px;
            }

            span {
                margin-left: 15px;
            }
        }
    }

    .el-aside {
        background-color: #333744;

        .el-menu {
            border: none;
        }
    }

    .el-main {
        background-color: #eaedf1;
    }

    .iconfont {
        margin-right: 10px;
    }

    .toggle-button {
        background-color: #4A5064;
        font-size: 10px;
        line-height: 24px;
        color: #fff;
        text-align: center;
        letter-spacing: 0.2em;
        // 鼠标放上去变成小手
        cursor: pointer;
    }
</style>
